What filesystem are you using? You should try to use a journalling filesystem like ext3, jfs, ReiserFS, etc. as they have much more tolerance of filesystem errors. Another helpful approach is RAID 1. If you have a single HD, you can still RAID two partitions. This will slow down writes, but gives you a second place from which to read in case of error. It is better to have a second HD, of the same kind, on a second cable.
Did you attempt to open a console to shutdown the system?
ctrl-alt-F2
login as root
kill naughty processes, etc.
shutdown -r now if necessary
You should try running memtest86 to check all that wonderful RAM...
i810 has a rep for causing crashes on some systems. If your board is ATX, you can switch to something like SOLTEK SL75FRN2 pretty cheaply. AMD 2500 makes it purr. Dual channel RAM, also.
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